Receiver, integrated circuit, and reception method

Abstract

A transmission line characteristic calculating section (23) estimates a transmission line characteristic according to an SP signal contained in a received signal. A symbol interpolation filter (24) is capable of frequency-shifting a frequency transfer characteristic and filters an output signal of the transmission line characteristic calculating section (23). A filter control unit (27) estimates the transmission line characteristic according to a CP signal contained in the received signal and observes the estimated transmission line characteristic to determine the amount to frequency-shift the frequency transfer characteristic of the symbol interpolation filter (24). The symbol interpolation filter (24) frequency-shifts the frequency transfer characteristic according to the amount of the shift determined by the filter control unit (27).

Description

technical field [0001] The present invention relates to an equalization technique for compensating for propagation distortion in mobile reception of terrestrial digital television broadcasting and the like. Background technique [0002] In terrestrial digital television broadcasting methods, for example, there are Japanese ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) method and European DVB-T (Digital Video Broadcasting-Terrestrial, digital video broadcasting-terrestrial) method etc., they adopt OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) transmission mode, which is one of the multicast transmission modes. [0003] In the ISDB-T method and the DVB-T method, the transmitting device periodically transmits a BPSK (Binary Phase signal) called a scattered pilot signal (hereinafter referred to as an SP signal.) with a known amplitude and phase at the receiving end. Shift Keying, binary phase shift keying) modulate...

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Problems solved by technology

[0032] However, even if the passband width of the frequency transfer characteristic of the symbol interpolation filter 152a is changed according to the Doppler frequency, it cannot be reduced at the same time. Figure 19 (f) and Figure 19 Both of the components of (g) are difficult to reduce the demodulation error of the equalizer 106 in the conventional receiver

[0033] In the above description, the Rice fading environment was taken as an example. However, due to the multipath propagation environment in which the reflected wave includes the specular wave, or the SFN (Single Frequency Network, single frequency network) In a propagation environment where a plurality of specular waves are simultaneously received, such as a frequency network environment, etc., the automatic frequency control unit 103 is made to set the The Doppler shift of the arriving wave with relatively large power is regarded as the frequency error of the received signal and frequency control is performed, which causes the same problem as the Rice fading environment

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